ua-tracer
by Paul Kinlan
trace NZrDYa8B
what does a user agent actually fetch, follow & run?
Trace NZrDYa8B
First seen: 2026-09-04 13:50:24.080 UTC
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36
Bot verification: ✓ verified Bingbot IP checked against published bot CIDR ranges; IP in Bingbot published range.
What this user agent did
Directly-referenced assets:
✓ fetched CSS
✓ fetched JS
✗ fetched image
✓ fetched font (HTML)
Document-level link hints:
✗ fetched favicon
✗ fetched apple-touch-icon
✗ fetched web manifest
✗ fetched preload
✗ fetched prefetch
Second-level follows (proves it parsed the linking file):
✗ followed CSS background-image
✓ followed CSS @font-face
✗ followed manifest icon
✓ followed CSS @import
Frames (does it descend into iframes?):
✓ fetched iframe document
✗ descended into iframe (loaded inner image)
Reporting (a report-only CSP is violated by inline styles; reports can arrive via HTTP headers with no JS, or via in-page beacons):
✗ sent a CSP/Reporting report (any path)
✗ delivered via report-uri/Report-To header (no JS)
✗ delivered via in-page beacon (securitypolicyviolation / ReportingObserver)
Social embed (Open Graph / Twitter card images):
✗ fetched og:image
✗ fetched twitter:image
JavaScript execution:
✗ EXECUTED classic JS
✗ EXECUTED ES module
✗ posted client timing
Server-side request waterfall
Every request the server received for this trace, in receive order. +ms is the delta from the
homepage request.
| Received | Δ | Kind | Method | User-Agent |
|---|---|---|---|---|
| 2026-09-04 13:50:24.080 UTC | +0 ms | homepage | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (8){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"traceparent": "00-8d34b277fd26f615b6c72aac7d7aba96-7d647b25818b8a48-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-09-04 13:50:49.250 UTC | +25170 ms | ES module | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (13){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-4235fad5bbd89bc10d86fa6dccc071e5-7e91c9eaee3f9d96-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-4235fad5bbd89bc10d86fa6dccc071e5-722ad3e1927137fa-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-04 13:50:49.447 UTC | +25367 ms | CSS | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (12){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-6a4eaf0f0f1fb80419889af8a057b9f0-0d603aa2a136ec6f-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-6a4eaf0f0f1fb80419889af8a057b9f0-7a68be873903e385-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-04 13:50:49.621 UTC | +25541 ms | JS | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (12){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-c568628b0f42e136ea42425fcc9127ae-49745e822d7347c6-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-c568628b0f42e136ea42425fcc9127ae-4e082dbdbe88af82-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-04 13:50:51.777 UTC | +27697 ms | font (HTML) | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (13){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-bf7fd07d13a66b1db3107677fde23854-e71acf9f634dfab9-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-bf7fd07d13a66b1db3107677fde23854-5999da12ecead275-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-04 13:50:53.913 UTC | +29833 ms | iframe document | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (13){
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/",
"traceparent": "00-ddf24724361d204e4b3b0dc163be82a3-281e843e1bdb9900-01",
"tracestate": "",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net",
"x-deno-userspace-traceparent": "00-ddf24724361d204e4b3b0dc163be82a3-0297ba214cb9cb21-01",
"x-deno-userspace-tracestate": ""
}
|
||||
| 2026-09-09 05:51:22.979 UTC | +403258899 ms | CSS @import (nested stylesheet) | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (10){
"accept": "text/css,*/*;q=0.1",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"referer": "https://uatracer.com/r/NZrDYa8B/EqnRNEyk/style.css",
"traceparent": "00-0bbe7c11d66c730e56b0b75b356c6325-6f39341a5b3628fa-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||
| 2026-09-09 05:51:23.215 UTC | +403259135 ms | CSS @font-face | GET | Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36 |
request headers (11){
"accept": "*/*",
"accept-encoding": "gzip, deflate, br",
"cookie": "ua-tracer-trace=NZrDYa8B",
"from": "bingbot(at)microsoft.com",
"host": "uatracer.com",
"origin": "https://uatracer.com",
"referer": "https://uatracer.com/r/NZrDYa8B/EqnRNEyk/style.css",
"traceparent": "00-118c3f4835a26ede292f8773a7483462-f2f36f15ed23c49e-01",
"tracestate": "",
"user-agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/136.0.0.0 Safari/537.36 AppleWebKit/537.36 (KHTML, like Gecko; compatible; bingbot/2.0; +http://www.bing.com/bingbot.htm) Chrome/116.0.1938.76 Safari/537.36",
"via": "HTTP/2 ord.vultr.prod.deno-cluster.net"
}
|
||||